Quick-change chuck



K. HSSNER QUICK'CHANGE CHUCK Filed nec. a. 1951 l z'sneets-sneet 1 www1:

Och 10, 193s.

K. HssNl-:R QUICK CHANGE CHUCK Fim-.1 Dec. 8, 1951 2 Sheets-Sheet 2 Patented oci. 1o, 1933 PATENT OFFICE i I QUICK-CHANGE CHUCK Kurt Hssner, Gera, Germany Application December 8, 1931, Serial No. 579,777, and in Germany October ,18, 1939 l: claims.

chuck formachine tools, particularly drills, with an insertedelement for holding the tool, which can be so xed Vby a locking device that the 5 tool cannot displace itself longitudinally within the'chuck. The principal object of the invention is to provide means whereby the inserted element can be easily and quickly inserted into or dismounted from the chuck, both when the machine is stopped and while it is working. According to the vpresent invention this object is mainly ensured by the fact that the locking device consists of locking'levers surrounded by a ring which -is arranged. on the chuck so that it can slide l5 longitudinally, the ring having surfaces which co-act with the locking levers in such a way that by slidng'the ring the locking levers are caused to lock with, or disengage from, the inserted ele-= ment. The ring consists preferably of two ring sections which can be placed on to the chuck from both sides, and are connected by screws or some means. In order to ensure that when the inserted collar lis pushed into the chuck the levers willV engage automatically, a spring is suitably arranged which normally holds the ring in the position in which the locking levers are in the locking position.

Thev transmission of the rotating movement` from the chuck to the inserted element (which 39 is of collar form) is suitably ensured by a lug arranged on the upper end of the inserted collar, which engages with a transverse groove of the chuck` andis provided with a half-cylindrical rounded part, so that the insertion of the inserted collar into the chuck while the machine is working is an' easy matter.

'I'he drawings show by way of example one embodiment of the invention.

In these drawingsz- Fig. 1 is a.V longitudinal section through the quick change chuck with the inserted collar and with the locking levers in locking position,

Fig. 2 is a similar section in the unlocked position of the locking levers.

Fig. 3 is a sectional view of an alternative form of construction in which the collar is inserted directly into a suitably shaped lower end of a rotating spindle.

Fig. 4 is an axial section through another modication,

Fig. iis a section similar to Fig. 4, this section being takenV at 90 with respect to Fig. 4 on line 5-5 or Fig. 4,

Flg.6 is also a view similar to Fig. 4, showing still another modilication;l and (on. 21a-'16) The present invention relates to a quick change I Fig. 7 is a longitudinal section through Fig. 6, on the line 7-7 thereof.

In the construction shown in Figs. 1 and 2 1 the chuck consists of a mainly cylindrical case or casing F which at its upper end is provided with '60 a cone-shaped journal F1. In the caseF are in longitudinal direction a number of slots or out' out parts, in which are arranged a corresponding number of locking levers B. The locking levers B are surrounded by an axially slidable ring, which consists of two ring sections R1 and` R2 which slide on to the case F and are rmly connected one with the other by threads or some other suitable means. Between the lowerend of the ring section R2 and a shoulder provided on 7@ the case F is arranged a spring D which tends to press downward the ring R', R2 consisting of 'two sections which is slidably arranged on the case F.

' In the bore of the case F is inserted a, collar E 75 which at its upper end is provided with a half cylindrically rounded lug M, which engages with a transverse groove of the caseF. The bore E1 in the inserted collar is cone-shaped in the known manner and 'serves 'for the purpose of inserting 8@ the shaft of a drill or other tool. On the outer circumference of the inserted collar E is a groove., or conical Ysurface G, the wall or shoulder G' oi which, facing the upper end of the inserted collar, is comparatively steeply inclined, while the other wall G2 runs over comparatively atly into the outer circumference of the case E.

The locking levers B which are enclosed in the two-part ring R1, R2 are at their upper and lower ends narrower than in the intermediate part and have at the outer side of the lower part a bevelled part B1. The upper and lower ends-of the loclning levers B co-act with the inclined or cam sur faces C1, C2 respectively, which are on the inner side of the ring sections R1, R2, the said inclined 05 surfaces being so arranged that when the ring R1, R2 is moved upwards, by overcoming the ten sion of the spring D, the locking levers B are so pivoted by the inclined surface C2 which en gages with their lower ends, that their upperends l0@ moved outwardly, while with the subsequent downward movement of the ring R1, Rthe lock ing levers B are again moved inwardly by .the in clined surface Cl which engages with their upper ends.

In the position of the parts illustratedin Fig`.l, the two-part ring R1. R2 is in its lower position, so that the locking levers B are pivoted with their,

upper ends towards the inner side, and engage `IUS circumference of the inserted collar E. `'li'hs ensures that the inserted collar E is prevented by the locking levers B from being pulled out from the chuck F. If the insertedcollar E is to be pulled out from the chuck, all that is necessary is to push the ring R1, R2 upwardly against the tension of the spring D. This displacement causes the locking levers B, through the action of the inclined surface C2, to move from the locking position shown in Fig. l into the position shown in Fig. 2, in which the upper ends of the levers are disengaged from the conical surface G of the inserted collar E, so that the collar E can be pulled out in a downward direction. When the ring R1, R2 is released again, it moves downwardlyagain under the action of the spring D, so that the locking levers B move back into the position shown in Fig. 1. f

When the collar E is inserted into the chuck F,`

the locking levers B are moved outwardly by the part of the collar E which is above the conical surface G, while at the same time the ring R1, R2 slides upwardly. As soon as the collar E has been entirely inserted, so that the lug M is entirely in mesh with the transverse groove of the chuck F,

` quite independent from the position of the chuck,

so that thechuck can be used in -an inclined or horizontal position instead of in the vertical position.

The construction shown in Fig. 3 differs from the one shown in Figs. 1 and2 principally in that the chuck F is formed direct by the correspondingly shaped lower end of the spindle S of a drill or other tool machine. This arrangement has the advantage that the tools will lie very close to the bearing L of the spindle S. Y

In the constructional forms shown in Figs. 4-7 the collar E is rotated by the case F by the intermediary of a catch member which is exchangeably attached to said case and is provided with a transverse groove engaged by the lug M of said collar. -In Figs. 4 and 5, N1 denotes said catch body, which is cylindrical at its exterior circumference which .engages a correspondingly shaped bore of the case F and is provided at its' upper side with a threaded stud O screwed into a correspondingly threaded bore of the case F.

1n the further modification shown in Figs. 6 and '7 N1 is the catch body which in this case has no threaded stud, but is threaded at its ex- 1 tenor-circumference. A corresponding thread is provided in the case F. Owing thereto, the catch body N1z can be easily exchanged, which is true also of the catch-body `N1 (Figs. 4 and 5).. The

collar E can be very reliably centered, as well as guided, in the case F.

l2 claim:

1. A quick-change chuck for machine tools, particularly drills, comprising a casing; a toolholding member adapted to be inserted in said casing and 'having a shoulder; independent means for transmitting rotation from the casing to the tool holding member; la. ring provided around said casing 'and the tool-holding member and having an inner'cam surface at each end thereof; and a straight locking member arranged within the ring and being loosely and tiltably mounted to tilt against and secure the tool-holding member in the casing, said ring being adapted to slide axially with a relatively short movement to tilt the locking member into and out of engagement with the tool-holding member when the respective end of the locking member contacts with its cooperating cam surface of the ring, and said locking member when in engagement with the tool-holding member being in a position to abut at one end against the shoulder and at the other endagainst the ring.

2. A chuck according to claim 1`, in which a spring is provided around the vcasing and bearing against the ring to normally maintain the` ring so that the tool-holding member will be in locked position in Athe chuck;

3. A quick-change chuck for machine tools, particularly drills, comprising a casing; a toolholding member adapted to be inserted in said casing and having a groove therein; independent means for the transmitting rotation from the casing to the tool-holding member; a ring.pro vided around said casing and having aninner cam surface at each end thereof; and a plurality of straight locking members arranged within the ring being in the vform of tiltable levers which are loosely mounted to tilt against and secure the tool-holding member in the casing, said ring being adapted to slide axially on the casing with a relatively short movement to tilt the locking members into or out of engagement with-` the grooves' of the tool-holding member when the respective ends of the holding members contact with their cooperating cam surface of the ring, and said locking members when in engagement with the tool-holding members being in a position to abut at one end in the groove and at 'the' other end against the ring.

4. A chuck according to claim 3, in which a spring is provided around the casing and bearing against the ring to normally maintain thering in position so-that the tool-holding members will be in engagement with the groove of the toolholding member.

KURT HSSNER.

IBO 

